Blank grinding machine



L. HAJEK Y 2,648,936

BLANK GRINDING MACHINE 5 Shets-Sheet l I l I I I l I I I I I l I I I I I I I I I I I I f ""1 INVENToR. Louis Hqcjelt BY prag/s Aug. 18, 1953 Fi-led April 27, 1950 /V Y mm Y a a WMF Aug. 18, 1953 L.\HAJEK BLANK GRINDNG MACHINE.

3 Sheets-Sheet 2 Filed April 27, 1950 Aug. 18, 1953 HAJEK BLANK GRINDING MACHINE 3 Sheets-Sheet 3 Filed April 27, 1950 cFE-n.

i I l.. I I l l INVENTOR. c2 'ek BY J zorvn'e Patented ug. 18, 1953 UNITED STATES PATENT GFFI'CE BLANK GRINDING MACHINE Louis Hajek, Jackson Heights, N. Y., assignor to Holub-Dusha Co., New York, N. Y., a corpora.- l

tion of NewYork Application April 27, 1950, Serial No. 158,409

4 Claims.

A main object of the invention is to providev a simple, eiiicient machine so that blanks of indefinite thickness may be rapidly and accurately ground on both sides to a desired thicknessv in one passage through the machine and are'then` ready for finishing processes.

A further object is to provide a simple and efficient machine in which one operator may handle large quantities of blanks and can easilyv and readily adjust the various elements to produce the exact thickness of blank desired and with a minimum of time and effort.

A still further object is to provide a simple and efficient machine in which a constantstream of blanks are fed to be ground on oneside and then automatically turned over and passed through a grinding operation on the opposite side and all the operator has to do is' to feed the blanks to a belt at an initial position after which the treatments are taken care of automatically and in a continuous manner until the blanks drop into a receiving hopper.

Further and more specific objects, features and advantages will more clearly appear from a consideration of the detailed specification hereinafter set forth, especially when taken in connection with the accompanying drawings which illustrate a present preferred form which the invention may assume and which form part of the specification.

In brief and general terms, the machine comprises a base frame supporting a plurality of platforms across which pass and on which are supported conveyor belts to receive suitable blanks to be ground. Grinding wheels are mounted adjustably with respect to these belts and may be accurately adjusted to grind the surfaces of the blank to just the right amount so as to produce blanks of exactly the desired thickness. The blanks are passed to one grinding wheel on a belt to have one surface ground and then are gripped between two belts and are gripped long enough for the belts to reverse their position presenting the other surface for grinding by another wheel through which the second belt then passes them. After the second grinding, the blanks drop olf the second belt into a receiving hopper.

The grinding wheels are mounted on slidable ways which can be adjustable readily to get the exact grinding position. The motors for turning the grinding wheels are adjustable with the GII 2, wheels so-thatthe drive' belt'connections do not have to be constantlyY adjusted every time a wheel position-is changed.

The present preferredform'which the invention may lassume is illustrated in the drawings, of which,

Figl is a side elevationof the machine with certainvv casings broken' away;

Fig. 2- is avplan viewf-of the machine;

FigaB is a vertical cross section taken onthe line 3 3 of Fig. l;

Fig. 4 isan-enlargedrpartial section showing a grinding-l wheel, aconveyor belt; and blanks to be ground.. disposed thereon; and,

Fig. 5iis detail-showing: ythe manner in whichy a grinding wheel support 'may be finely adjusted to get` exactly the desired position thereof for grinding a'blank surface.

Referring'now merelyl to the specific form of the invention which is shownin the drawings, it will be noted that there Ais a base I, from which pedestal members -l i, I2, andi l 3 extend upwardly. From these'pedestalsthere are supported in any suitable manner adjustable grinding wheels it and I5! and belt conveyor-supportingv platforms I6; Il, and I8.- There are two endless conveyor beltsy I9 and 20; passes around' pulleys 2l'r and 22 mounted on shafts 23 and `2li whichare supported on a frame member -25 which is supported from vthe pedestal member l2 Ain any suitable manner not shown in detail. The endless `beltA 2U passes over pulleys 26, 21, 28, 29, andf30fwhich are mounted respectively onshafts 3'I, 32;33,.3!l, and 35 suitably associated also with the frame 25; All these pulleys above mentioned are disposed in one plane. Infpassingvaround'from pulley 3i? back to pulley 26, theendless belt 2i) will be seen as passing aroundthe'pulley 22- carrying the other belt IQand'fOr'asubSt'antial arcuate distance the two belts arelin-contact to hold therebetween blanks AA as vwillbe later set forth.

The upper `run or reach of the belt i9 passes along and rests'upon the platform Il and passes underthegrinderwheel I5. Theupper run-oi1 reachof the'other-belt 20 passes along and rests upon the surfaceof the platforms' it Aand i8, and while on Y*the platform I6 -Ipasses under the grinder wheel lli'. The shaft 36- of thegrinder wheel l5 is rotatablysupportedinva casing 3l which is vertically adjustablev withresp'ect to the upper endofthefpedestal [3v-by means of tongue and groovefabutting faces asindicated generally by the number 38 A-in Fig.' 2, A threaded stem 3s Beltv I9l extends between andV 3 I3 and its threads engage an ear 49 on the casing 3l which extends through a slot llI. This stem can be rotated by means of a hand knob 42 on the top thereof. Spaced rods 43 and all dependent from the casing 3l slidably support sleeves 45 and 4S on the frame 47 of the motor e8 the shaft 49 of which has a pulley E0 and a belt I extending over the same to a pulley 52 on the end of shaft 3E of the grinder wheel i5. On this same shaft 36 is another pulley 93 over which passes a drive belt 54 extending to and around a pulley 55 on the end of shaft 23 of the belt pulley 2! above mentioned. On this shaft 23 is a worm 5S meshing with a worm gear 51 on a vertical shaft 58 at the lowerend of which is a worm 59 meshing withv a vworm gear 69 on the shaft 33 of the pulley 28 shown in 1Eig. l. This mechanism affords means whereby the motor 38 drives the grinder wheel l5 and also the two belts I9 and 29.

Suction chutes 9i and 62 are disposed adjacent the wheels Ill and I5 to draw off the fine material ground off the surface of the blanks. The wheels are partly enclosed by cover ,plates 63 and 94 pivoted at 65 and 66, any suitable latehing means, as shown at (i1- G8 being provided to hold the cover plates closed when desired. The pulley 29 is disposed on the end of an arm 69 pivoted to the frame and engaged by a spring 'I0 to exert pull on the arm and keep the belt 29, passing around the pulley 29, under constant tension.

The grinder wheel I4 shown at the left in Fig. 1 is mounted in the same manner as the grinder Wheel I5 above mentioned and is related to and moved with its drive motor in the same manner. This mutual adjusting movement of each grinder with its motor permits the connecting belts between them to be maintained in constant tension without having to readjust them every time the wheels are adjusted for different amounts of grind. A hopper lI, which has a descending conveyor chute (not shown) or some other suitable means for dispensing the blanks, is filled with the blanks A and they spill out on to the top of the conveyor belt I9 passing along the platform il and can be spread out on said belt by the hands of an operator seated at this point. This operators position is also convenient for adjustment of the wheels to adjust the depth of grind. Referring now in brief and general terms to the operation of this machine, it will be seen that it is simple, compact and capable of easily and rapidly handling a continuous stream of blanks passing from the hopper 'II on to the belt and being spread out thereon by the operator. The belt I9 passes to the right along the platform Il and moves the blanks A under the grinder wheel I5 which has already been adjusted at the proper level to produce the determined cut. The fine dust ground off is immediately sucked away by the suction chute or tube 62. This first grinding operation then grinds the upper surface of the blanks which pass beyond the wheel on the belt I9 and just beyond the suction chute 52 the belt I9 with the blanks thereon meets the other conveyor belt which closely abuts it as they both pass in this abutting relation around the pulley 22 and thereby hold the blanks firmly between them until the belt 20 starts on its horizontal run along the platform I8 at which point the belt I9 leaves its abutting relation with the belt 20 and the blanks A now disposed with the unground face upward are carried forward by the belt 29 across the platform IS to and beneath the grinder wheel i4, which has already been adjusted to its grinding level. Then the last surface of the blank is ground and the dust carried off immediately by the closely adjacent suction chute 5I. Beyond this point the completely ground blanks drop off the belt 20 into any suitable receptacle (not shown). It will thus be `clearly apparent that blanks may be fed on to a belt system and passed through the machine to receive two grinding operations so that opposite faces of the blanks are ground off to produce exactly the thickness ofblank desired and that this complete grinding operation is performed in one machine which can be elciently handled and adjusted by one operator whose main function after the machine is started is to keep the blanks fed on to the belt system and properly spread out thereon. In previous grinding devices there has been the need to run the blanks through two machines to grind both opposite surfaces or to run through the same machine twice and to turn the blanks between these two separate operations. This has involved more time, and labor costs and required more machinery. This novel machine avoids all these complications in the simple and efficient manner shown. The blanks are fed by the belt system and ground on one surface, turned over, and then fed to another grinder to grind the opposite surface, all in one continuous rapid and effective manner. Nothing has to be done to the blanks except to subject them to necessary finishing operations which, in any case, would have to be done in other types of machines.

While the invention has been described in detail and shown with respect to the accompanying drawing, it is not to be limited to such details, since many changes and modifications may be made in the invention without departing from the spirit and scope thereof. Hence, it is desired to cover any and all forms and modifications of the invention which may come within the language and scope of any one or more of the appended claims.

I claim:

l. A grinding machine lcomprising a frame, a pair of primary pulleys, one being a supporting pulley and the other being a blank reversing pulley, mounted on said frame, a primary beltlike endless conveyor carried by and passing about said primary pulleys and having its upper and lower reaches extending longitudinally of said frame, said upper reach being adapted to receive thereon blanks to be moved forwardly by said conveyor toward said reversing pulley, a group of secondary pulleys, one being a delivery pulley, supported by said frame, a secondary beltdke endless conveyor carried by and passing about said secondary pulley and having its upper reach, in part, disposed beneath the lower reach of said primary conveyor, said secondary pulleys being so disposed with relation to said primary pulleys that said secondary conveyor passes over said reversing pulley and there engages said primary conveyor throughout an extent thereof equal to a substantial arcuate length of said reversing pulley, whereby said blanks are carried over said reversing pulley and delivered in an inverted position onto the upper reach of said secondary conveyor to be moved rearwardly thereby beyond said primary conveyor and toward said delivery pulley, a primary grinding wheel mounted above the upper reach of said primary conveyor and there adapted to engage and exert on said blanks a grinding action as they move toward said reversing pulley, aseoondary grinding wheel mounted above the upper reach of.v saidv secondary conveyor and there adapted to engage andexert on'said blanks a grinding action as they. move toward said delivery pulley, and power means operatively connested to said conveyors forV so moving them that the respective upper reaches travel in opposite directions. v

2. A grinding machine comprising a frame, a pair of primary pulleys, one beinga supporting pulley and the other being a blank reversing pulley, mounted on said framea primary beltlike endless conveyor carried by and .passing about said pulleys and having its upper and lower reaches extending longitudinally of said frame, said upper reach being adapted to receive thereon blanks to be moved forwardly by said conveyor towards said reversing pulley, a group offl secondary pulleys, one being a delivery pulley, supported by said frame, a secondary belt-like endless conveyor carried by and passing about said secondary pulleys and having its upper reach, in part, disposed beneath the lower reach of said primary conveyor, said secondary pulleys being so disposed with relation to said primary pulleys that said secondary conveyor passes over said reversing pulley and there engages said primary conveyor throughout an extent thereof equal to a substantial arcuate length of said reversing pulley, whereby said blanks are carried over said reversing pulley and delivered in an inverted position onto the upper reach of said secondary conveyor to be moved rearwardly thereby beyond said primary conveyor and toward said delivery pulley, a primary grinding wheel mounted above the upper reach of said primary conveyor and there adapted to engage and exert on said blanks a grinding action as they move toward said reversing pulley, a secondary grinding wheel mounted above the Lipper reach of said secondary conveyor and there adapted to engage and exert on said blanks a grinding action as they move toward said delivery pulley, a rigid support disposed beneath the upper reach of said primary conveyor for there supporting that reach against downward deflection with relation to said primary grinding wheel, a rigid support disposed beneath the upper reach of said secondary conveyor for there supporting that reach against downward deflection with relation to said secondary grinding wheel, and power means operatively connected to said conveyors for so moving them that their respective upper reaches travel in opposite directions.

3. A grinding machine comprising a frame, a pair of primary pulleys, one being a supportingpulley and the other being a blank reversing pulley, mounted on said frame, a primary beltlike endless conveyor carried by and passing about said primary pulleys and having its upper and lower reaches extending longitudinally of said frame, said upper reach being adapted to receive thereon blanks to be moved forwardly by said conveyor toward said reversing pulley, a group of secondary pulleys, one being a delivery pulley, supported by said frame, a secondary beltlike endless conveyor carried by and passing about said secondary `pulleys and having its upper reach, in part, disposed beneath the lower reach of said primary conveyor, said secondary pulleys being so disposed with relation to said primary pulleys that said secondary conveyor passes over said reversing pulley and there engages said primary conveyor throughout an extent thereof equal to.. a substantialv arcuate. lengthof said;` reversing pulley, whereby said blanks are; carried; oversaid reversing pulley and delivered in an` inverted positionv onto the upper. reachv of said, secondary conveyor. to be.. moved rearwardly.

thereby beyond said. primary conveyor and to;-

ward said,v delivery pulley, vertically adjustable,

primary .supporting means, a primary grinding Wheel'rotatably supported by said vertically ad:-

justable primary` supporting.v means abovev the.

upper reach of said primary conveyor. and there adapted to engage and exert onsaid'blanks a grinding action as they move towardlsaid revers,-

ing pulley, adjusting means connected to said.

primary, supporting means for moving said primary grinding wheel vertically toward and away from the upperreach of said primary conveyor, vertically adjustable secondary supporting means, a secondary grinding wheel rotatably supported by said vertically adjustable secondary means above the upper reach of said secondary conveyor and there adapted to engage and exert on said blanks a grinding action as they move toward said delivery pulley, adjusting means connected to said secondary supporting means for moving said secondary grinding wheel vertically toward and away from the upper reach of said secondary conveyor, and power means operatively connected to said conveyors for so moving them that their respective upper reaches travel in opposite directions.

4. A grinding machine -comprising a frame, a pair of primary pulleys, one being a supporting pulley and the other being a blank reversing pulley, mounted on said frame, a primary beltlike endless conveyor carried by and passing about said primary pulleys and having its upper and lower reaches extending longitudinally of said frame, said upper reach being adapted to receive thereon blanks to be moved forwardly by said conveyor towards said reversing p-ulley, a group of secondary pulleys, one being a delivery pulley, supported by said frame, a secondary beltlike endless conveyor carried by and passing about said secondary pulleys and having its upper reach, in part, disposed the lower reach of said primary conveyor, said secondary pulleys being so disposed with relation to said primary pulleys that said secondary conveyor passes over said reversing pulley and there engages said primary conveyor throughout an extent thereof equal to a substantial arcuate length of said reversing pulley, whereby said blanks are carried over said reversing pulley and delivered in an inverted position onto the upper reach of said secondary conveyor to be moved rearwardly thereby beyond said primary conveyor and toward said delivery pulley, vertically adjustable primary supporting means, a `primary grinding Wheel rotatably supported by said vertically adjustable primary supporting means above the upper reach of said primary conveyor and there adapted to engage and exert on said blanks a grinding action as they move toward said reversing pulley, adjusting means connected to said primary supporting means for moving said primary grinding wheel vertically toward and away from the upper reach of said primary conveyor, vertically adjustable secondary supporting means, a secondary grinding wheel rotatably supported by said secondary supporting means above the upper reach of said secondary conveyor and there adapted to engage and exert on said blanks a grinding action as they move vtoward said delivery pulley, adjusting means connected to said sec--V ondary supporting means for moving said secondary grinding wheel vertically towards and away from the upper reach of said secondary conveyor, a rigid support disposed beneath the upper reach of said primary conveyor for there supporting that reach against downward deection with relation to said primary grinding wheel, a rigid support disposed beneath the upper reach of said secondary conveyor for there supporting that reach against downward deection with relation to said secondary grinding wheel, and power means operatively connected to said conveyors for so moving them that their respective upper reaches travel in opposite directions.

LOUIS HAJEK.

References Cited in the file of this patent UNITED STATES PATENTS Number Number r 1,385,000 1,402,020 1,505,867 1,862,676 1,908,029 1,958,525 1,958,526 2,118,548 10 2,170,687

Number 8 l Name Date Gring July 19, 1921 Smith Jan. 3, 1922 Cote Aug. 16, 1924 Gitzendanner June 14, 1932 Larson May 9, 1933 Weber May 15, 1934 Weber May 15, 1934 Carlson May 24, 1938 Johnson Aug. 22, 1939 Mautz Dec. 19, 1939 Moscini Mar. 19, 1940 Morris July 29, 1941 Eddy Feb. 13, 1951 Williams May 8, 1951 FOREIGN PATENTS Country Date Italy Feb. 15, 1935 

